Improvement in stone-drills



FFIGE.

THOMAS WOODS, OF NIOHOLASVILLE, KENTUCKY,

IMPROVEMENT IN STONE-DRILLS.

. Specification forming part of Letters Patent No. 179,636, dated July 4, 1876; application filed January 22, 1875.

To all whom it may concern: in the form of a curved slope, H, with grad- Be it known that I, THOMAS WooDs, of ually-increasing breadth of curved surface Nicholasville, Jessamine county, State ofKento same point H", where both sloping edge tucky, have invented a certain new and useand cam -surfa ce abruptly give way to the fol Improvement in Tripping and Elevating natural surface of flange H.

Devices for Rock-Drills, Trip-Hammers, &c., To a point at the commencement of the surof which the following is a specification: face H, or any other within its limit, is se- My invention is designed as an improvecured, ingroove 0, the end of chain F.

ment upon the device for which Letters Pat- When the machine is set in inotion, the

, ent of the United States were granted to me pulley O, revolving in the direction of the ar- December 4,1866; and consists, in the first row, as seen in Fig. 2, winds the chain into 9. part, in forming the tripping-pulley of same the groove 0, and accordingly raises the drill with a sloping edge of gradually-increasing to a height equal almost to the periphery of curvature, for the purpose of lessening the groove 0, or until the first contact of chain amount of wear upon the chain or rope, and F from the drillis at H, where there is no at the same time lose the least amount of support forit, on account of the shape of the power in slippage. My invention consists, in cam El 11', when the weight of the drill the second part, in the provision of a swivelstarts the chain from the groove, and the ing block in the drill-chain, between the drili- 'said cam H H completely removes'it, leavbead and trimiing-pulley, to guard against ing the drill to make its blow unretarded; torsion, and provide for the free play of the and it is evident that the shape of cam H drill; and my invention consists, in the third H, being curved as it is, provides for the part, in the provision of an idler-pulley in least amount of wear upon the chain, and line with the tripping-pulley and a drum atleast amount of lost power in slippage:

tached to thehorse-power, by the use of which It is also obvious that the chain, in being mechanism the drillrope or chain can bedrawn carried around pulley (J, will acquire a cerin or wound up conveniently. tain amount of twist, which I propose to rem- Figure 1 of the accompanying drawings is edy by means of swiveling blockf.

a perspective view of a stonedrill embodying \Vhen the drill has been sunk to considermy invention. Fig. 2 is a front elevation of able depth, and it is desired to withdraw it, the tripping;pulley. Fig. 3 is a side elevait is only necessary to pass the lifting-rope tion of the same. Fig. at is a detached view (shown in dotted lines in Fig. 1) over pulley of the swiveling block. 6, pulley I, and attach it to drum a, around .A is the'driving-wheel of the horse-power, which it can be wound, and the drill be pulled to which is secured the draft-beam a and u out by the same horse-power.

drum, to. It is fitted with bevel gear-teeth, I claimto engage with and operate the bevel-pinion 1. For a stone-drill or analogous use, the B, attached to t e shaft 1), to which the triprevolving converse-sloping cam and grooved ping-pulley O is secured. The shaft 1) is sepulley O c G H H H H, constructed, concnred in bearings on a bed-plate, I), which nected, and operating substantially as and for also supports the horse-power A a a. Rising the purpose specified. from this bed-plate D, just in front of pul- 2. In combination with pulley 0, constructley (J, is a derrick-post, E, somewhat taller ed as described, and pulley e, and chain F of than the drill-shank, and fitted with an idlera stone-drill, the swiveling socket-linkf, subpulley, e, for the drill-chain F and rope to stan'tially as and for the purpose specified.

travel on. v 3. In combination with pulley e and drum The chain F, as seen in Fig. 1, passes over a on horse-power, the idler-pulley I, con-' 1 pulley c, and, as seen in Figs. 1,2, and 3, at nected and operating substantially in tho taches itself to the pulley O as follows: The manner and for the purpose specified. pulley O has a grooved periphery, c, with In testimony of which invention I hereunto the flange G preserved entire, while the flange set my hand.

H is cut away in the form of a cam, com- THOMAS WOODS. mencing at the desired point H on the pe- Witnesses: riphery, and running inwardly to bottom of J. W. HAWKINS,

move 0 at H with its outer ed e out awa J AS. F. LEWALLEN. g 7 a: y 

